Two parallel metal plates are arranged 15.0 mm apart in a vacuum. The lower plate is...

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Two parallel metal plates are arranged 15.0 mm apart in a vacuum. The lower plate is at a potential of +100 V relative to the upper plate. There are two parallel slits A and B in the lower plate that are 25 mm apart. A collimated beam containing electrons of different speeds is directed towards slit A at an angle of 60 with the plate. Electrons emerging from B all have the same speed. 15 mm 60 A 25 mm B (a) Explain why all the electrons emerging from B have the same speed. (b) Determine the speed of electrons that just reach the upper plate. (c) Determine the speed of the electrons that emerge from B. Two parallel metal plates are arranged 15.0 mm apart in a vacuum. The lower plate is at a potential of +100 V relative to the upper plate. There are two parallel slits A and B in the lower plate that are 25 mm apart. A collimated beam containing electrons of different speeds is directed towards slit A at an angle of 60 with the plate. Electrons emerging from B all have the same speed. 15 mm 60 A 25 mm B (a) Explain why all the electrons emerging from B have the same speed. (b) Determine the speed of electrons that just reach the upper plate. (c) Determine the speed of the electrons that emerge from B.